Archived tricks Archived tricks – Façades during any kind of weather – Chemistry: flame test – Hydraulic renders – Fast identification of the source of salt efflorescence by means of pH paper 1-14 – On the origin of the « moist areas »… – The « Pierre Jaune » – On the sources of salts in masonry, 1st part: – Clay minerals? – Detachment? – Drop test, 1st part